Remaining lifetime modelling for replacement of power transformer populations

A. Schijndel, van, J. Wetzer, P.A.A.F. Wouters

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

11 Citations (Scopus)
182 Downloads (Pure)


The age of the majority of power transformers applied in the western electricity network varies between 25 and 50 years. Depending on the load history and time of operation, replacement on short term is imminent. A technically sound policy concerning the replacement of these assets must be based on knowledge of (i) the life expectancy or reliability of individual components, (ii) how these failure probabilities cumulate to a replacement wave, and (iii) how to manage an expected replacement wave. The population reliability is obtained from individual transformer reliabilities using Arrhenius based modelling of paper insulation degradation. This modelling technique includes measures to cope with inherent uncertainties in available data. Population reliability figures are obtained using an adapted k-out-of-N failure model. The modelling method is applied to existing populations of power transformers in The Netherlands, to evaluate their expected replacement wave.
Original languageEnglish
Title of host publicationCondition Monitoring and Diagnosis, 2008. CMD 2008. International Conference, Beijing, China, 21-24 April 2008
PublisherInstitute of Electrical and Electronics Engineers
ISBN (Print)978-1-4244-1621-9
Publication statusPublished - 2008


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